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Evolution of a FeV sigma phase ball-milled in a mixture of argon and air
Authors: B.F.O. Costa, G. Le Caër, B. Malaman
Ref.: Hyperfine Interactions 183, 67-73 (2008)
Abstract: A coarse-grained sigma phase Fe(48.1)V(51.9) was ground in argon in a vibratory mill in the presence of a small but steady air supply. The oxygen content increases regularly at a rate of about 0.25 at.%/h. During the first 140 h of milling, the sigma phase transforms into a heterogeneous bcc alpha phase because of a preferential oxidation of the sole vanadium atoms into V(2)O(3). At that milling time, the average composition of the remaining bcc alloy is similar to Fe(80)V(20). Mossbauer spectroscopy shows too the presence of an amorphous phase. For longer milling times, ternary Fe-V-O spinel phases do form.
